SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b32342b6301c227990741baf7114c4ff79aaa872616b96de99528d6a8927f5e' 
  AND token = '0MJVR8aTEhr4+mthL2sjr+12BCJKz+RJMQrflpVu2S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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