SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f29c4f5d9f6406eece57e6dbca369ee29ed5b6e929b544aec3b0b548822cb511' 
  AND token = 'HN3Y8QzrFqvCOGtk+50BZCsJMnUMPtfg/BUeeg4/KpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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