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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1036fe9e996d8f9d92d52291e6cc724fda960a521befe57c54481632b9344573' 
  AND token = 'Rt9cQwmzjFz3SQFtpRClG05ks5a5Q2Q/O3UDWF0aBaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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