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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8573a2080a190777c5717f79d5a4c8a89feb05b5bae74fad49e779867e883116' 
  AND token = 'E5ybFe0phLkvtbYk/hOAv3vYvJ00hWEA51G+zsJsA+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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