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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3582d5bedd9fd4f203568321de9281c8da919d42ae83ebdbba2011cf49482b45' 
  AND token = 'go1M7PV43cA8wLeSY/WCJNf8KLrHpiWIIyb+NNPMTyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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