SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08f939026d4c831cfe8fb892988d955816219bf1092d7341d50ec9d72740a7cf' 
  AND token = '45w6kzBvg6S9FG+zo3WjtR2yIRACcXKpsWP/yc0ouZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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