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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '046649eee39fdcca6afbb64ac4986e59456c1cd88753172786663fe646c49b74' 
  AND token = 'owGmBkEEnWK8hc8+ErJSdqXx+McSgJIr+rcCo8kylFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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