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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3399d747baf9d1b315a656deebed554f1df82b651deb5dcdc3a014e0631eb510' 
  AND token = 'EcY4ofhlJd0U4tei+pS/Ix4cFx+dXEHk5xmDH/I+FKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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