SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa4c7f37dcbe1b0039b2774244c55955581c44e8904ce391898540780395367' 
  AND token = 'bGSWv79sqZg9dLeqBQOdV6RN/wu8r+xd4AUdDBYjXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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