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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c24c2d20eeec1d959678130918c55b4838c5e7b346016d9a9bd748b99c36660' 
  AND token = 'GobOc+pUuMSfshyNffRuu1vlENAijK6UuEHwDS9Q8dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}