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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f04cf3565ae40aa851393eeae5deee9a83a2e77431f7b05865009bedcf71234' 
  AND token = 'j9nbmwm4nbMGXLmXp7kstg6K/yxzJ32ReM5XxNHkUdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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