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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a18f6289ee68aef3265f966e8af159588d330d58cbf1a32dd1dcccf3693d7d' 
  AND token = 'XGDUFOfAyv3NM3VJUz5dWBa10qNjqnt8kuE1ql42vrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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