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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac0b7665d4f3fe85299015da905078aa6d80f7d95fd65d1fc6f4bf44915cef1' 
  AND token = 'bdZiWEDYECVuhxcN12fozbb8XiU6SrRsE43QCntKb3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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