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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d13eb64b0a4ef2c5e1068730dfcb3fa43e98ba80238f55b3de358e0c4c2347a' 
  AND token = '0t+n9fWg3wo+TeO5EPCzq4akkHlo39MOCf3TzsbWHhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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