Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7d14aaff1cca223aa68ded69d59f234a2b4e6ff44aa589b1028933ed1f55d2' 
  AND token = 'GkDslX1ieeY5c3BGR+9HGZojc7vJlI3+aqV0dFO6iMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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