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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '657c3dd524e3b6f2faa978052cc797277b63d952c7a97d115d7b21f1ad08e46f' 
  AND token = 'oOQPObpF8/WFPppRPLgHmzYTwr4xWKu5bpIib/7Hw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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