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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a42c2965731c35a3b815971e2add11928a31662c45fac010067f9fdb4cd567fe' 
  AND token = 'AqBxtuFT2QYhoMFcTj7MYqYnAyuQiD7Lpe2+Z7aUiEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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