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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bc48156d09cd511b766a9327036c40f711cb3a83fa2b133648363d679f8ed7b' 
  AND token = 'lPC9rY/Ha+UWT9TGNG6xibums3Otz9yfF0UNeObGZd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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