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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9e2d409d7d98ce8ffeacda1bdd3c2dcd430c745d3da639d32c7d78c18319a5c' 
  AND token = 'qpph5TgiNJ1Uf/XZbIzxefJmCwSgin/+au1Bx8NEZ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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