SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b9bcd95b78e359eebaa886a2b69f5156c660ce3de44b91a37198d2d752cc537' 
  AND token = 'FoclX8KWjKUn/hJoSUeDD8NmOHyOF1GEBukmLIuqUpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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