SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04842735f2324b5152d7d08bda2311608ced5a06da361fc061a1493ebc069d87' 
  AND token = 'WSKXlM3jwM4iL8kqiEQ2ypnpbmrJhYfpB99w8z0pNtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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