SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '453fd43627d2d749a8826c3dd254c34367fb7e5ebdea45340e124dea4a8de87a' 
  AND token = 'x3ktgvfz7gGTQD1No4sKxie5HqYU+HVJ4BGTrCg49Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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