SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1618a0a0bf70c3afd0d58dd91d0b203425265b8bbde68599fe4b96b31a5f4f4c' 
  AND token = 'RGUmzqANNqcuHHLK/5nTjLwq2QudJIGkJB7bSw0A5Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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