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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd061d0b427b07537788aa67acec8022dc56e475e18dc7c9b94c3252ce7d039f2' 
  AND token = 'ohQ423sOcW/xwR9/Ckv53EQIw0Er2madxjIpQW0KXTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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