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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '898eb9d5c93ac89d7fe7e5cfeea994292b3f70a8ad975de067af566b106e602a' 
  AND token = 'eke9h61VqNyqVhqWvJgvC6LyFJINwJiUaN8hiFBchEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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