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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1029f2315ca2e2ecd7b5b3846dcd9d02f95ccb327c92c541b157c5a434b3508f' 
  AND token = 'q6UXoqIhPnsQJh8XHO59WVft6pSNZHUKjEemejca0Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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