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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eec40092dc95935f633d84eb0e58e4e601cdcab4e58523d36aaa2ea18d961ad' 
  AND token = 'JAHZJ0fqun3H9LuOhgjTu2KR5kUMD7UGDAhR9LK/xWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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