SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2e738b5def9eb30962dc4469d62aac4249a2c67721698e7057286bcc49a9c66' 
  AND token = 'omeZyq0hPSKYDVwEf44a8kbH8GS+Vej/SnJOJKTdzUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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