SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9213a845b064680f7dfad7332cf14f699c7e57f99745c8b03bef3171219e38' 
  AND token = 'Z0yvi7JeMB5jTAWyxJjBg+2S/INshi9TQeosPT0tkJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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