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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '841b8b9722016181d975f97ddf22297181c71ee5af8b7e946206460eabc2cb6d' 
  AND token = 'CCbm9SIAz83Mg8GmnV0NDiwFJpVciDyMFD6VsnC20zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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