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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91fe7b847e9c6a363c93d064b042e70ac1e58cca3e696820d2dabc5b63018cee' 
  AND token = 'N8EmNu35PnOtKHX/S9/Mx/ALj+KTjL84fd0QPNHe/Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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