Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f1a542e5779daadba0133db47d5345daafc4c2f05852dc5208259ca599be41' 
  AND token = 'mFyb0mfiiYn/hUYjQlApoVfayT4rTBuxBMB6RVIBm+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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