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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6bda800dd5407792740cb57c4d846804e47b717440750d58b01628102230475' 
  AND token = '/NBuZEGvklEY48kcVl+KZKxLb0nJYK5anCLBLfHC6qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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