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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5200b76ec32277d1456ae319d9ad14b2bf376d753c463293e2926b462902b3' 
  AND token = '1H9v9/TT5JkL5V0spYYGo4hDlZE9Eep1bkwZTYpl3BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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