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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecbb6f031036f2cbb4f6acdc051359b6cfa30820d6ef28d751e5d3272a57e7db' 
  AND token = 'inMK4nS1reaenRUbpww/UC7fyVkt9f6fTLKxOb75vdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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