SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a65019a233348369173002dd14a0d885f8dff17104818e407c11dc2b626cdce7' 
  AND token = 'sUQwwuqbKEEaJ3wQ/Eyqe6CqhgnteYg4XNXBsXsewZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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