SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7f74edf58ee344f225cf5627d8ee8e37d6209f6fb229880459d0792a1d582e7' 
  AND token = 'l8ufhgPYX/di/C942fvb0t5DZg4zquBvQrw65cVvTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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