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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d9d23503df63f80744cb968a251edfb5ea3d2e56c2a7387dbdad55628cd3621' 
  AND token = '9ElU9oCo7/nb2jTKfsJaaRStERNwZK8vPcFsUXb25cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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