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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ea885d47276435c2b02c8a13b9e5962c367f9bbab4f9e47ab9ed44433c75fff' 
  AND token = 'U2HJBhOJG+2NxL9Y0cTnbqE0rO1GVqin0lkTCra80B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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