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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ed17f425ae2eee21690145b2161f51a79561dc005cf15151ab57bc21b01854' 
  AND token = 'NcYfoIYgcmO4S8ipNmIabBJcMjVEQgT/soruH+o9xw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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