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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b21729847a8f13b07c740eebd07330de75764d52243b87e36f41eb2ed77665f' 
  AND token = '2yYefx0FZOEJxwi+D/073sQD+c7GC8r4lhxlPZC5wqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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