SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c53bf867e6cf32ab77a538b159af13b22d58b717345c2cf4530f67167b7abda4' 
  AND token = 'e+6V+WoWAG/VYIy7jvhqzd4bjUNhK+2ka49LynY5uWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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