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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff1204680ecf42d2bdcd13e6af8850d12e2fd0000ef459e3d06c28b61f8d6e0c' 
  AND token = 'k6C0v4BWv6JZ0gXcJv5QkYLemuVB7/8PsB3eEHOACW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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