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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a769c36c8ced7f4fbbb812767dbfbc0b2c21f57abb89584e5abe8d36015043' 
  AND token = 'x/tiq7aZoZ6P44DsvNiwFO53h8Iab48uap/GIQ4izjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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