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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b78badd9160b67c02bc912023391c507c1d1f8aa612ead1f4a2fb3ea72270d0' 
  AND token = 'I8uj3A8LRtWxHZgDyUyy10mOxgbBNNOlcnOlCuktAUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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