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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34cfe708e4ddf7d7d1324e1ad5c7f58f3bce72891dedd55044afc8cb54a2724a' 
  AND token = 'mGhmW1QlEf4EYNz31/qPS/neyC8ZWX+RwU/eg2ee7Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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