SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b172d1d6502d80657a61a5c432b03164b0ea8e6b907048e42865f4271997170' 
  AND token = 'rwJVkFe+cnxPTHhDBX8NdR1TwhKCPZvDdWldvDLwECs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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