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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82f647c127bb219ba8a8d9c4f91425ae787c849494bcbc2c743708549232f40e' 
  AND token = 'VXy+KXL5y7FcebWv61re5HOrWu+KVXj/DbnC0GI3dYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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