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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e477bdfed8d0847bf5dfe34e582dfcef8a3e2932975e408e65a74ba2feabffcd' 
  AND token = '+diFEf1BfI7hQFB2RFmqbr9ygg+e6xoKn3NnzaIJsAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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