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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fc9c0db2debb518cd32b740c8c8d9b84171ea288e14111b0d8abfb1a9bc4504' 
  AND token = 'Ltb2BfUmOj5avqcSaGIlGrQp3GIp7Pb4A6csDWCjVlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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