SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c92a9e9cdb4cd763a1f5e2f299f80aa2ca8436f774640e72796108ff620782c' 
  AND token = 'EOOssb+N+z450a7mBJhgHUFc1KWYxGib4qnYqmXXbrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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