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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b04fe0bc48ade15f093014f1edb03860653e233603ef0cca412966d8abed1b12' 
  AND token = 'a3qQuR0Y960C73u+Iid/b6HqMpgZhb3Ky//Y1P7ownw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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