SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71111d4886931b6b2e55e1df0426d6fa5400c8f83525636f6c639f7410994648' 
  AND token = 'mhzONsAg29b4PPHFzhIBQycC9gwpQcP3Ezm0vh6UgDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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