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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '576b6d0599d4fc8946876e77bd14dba25fcd58c980708c4496cc979a05add7a7' 
  AND token = 'UxFnmvl+bmuPu8IfnlxYu4Zhk7aurz0aFhmjuz/jZYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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