SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0146cf3f043c9b7c744e151a3c2c6efaa079e77f9de832fcc387980b9a0648' 
  AND token = 'TPuhO/usWn1q9K67XyRJEFsfE7Zv/Q9Fo5KpGxKu/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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