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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de34acf4db29b8b55989725494c6bfa4c902904b5b441e39043e69399f07ef9d' 
  AND token = 'jPHrBce4XWppEbGNmRU7aOPKI8zaNMijGRvIFNJaYpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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