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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '164be4d1847300f6a0ca743ad2bbd3620af5de5552f77a93cd8c19a66261d6e7' 
  AND token = 'sUbYF05fMG4GU795oA5rKm0VOQ+YY1Tr09/chRrbFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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