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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20bc3718ace21819ba63822b069e8d38c116a9052ec92d1b48a189dd81ca4b14' 
  AND token = 'gTD9PlJ3uXJwHowcdY1PR0shfwjBKv8fymik2A060CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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