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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '476223412b1204ade91be2aa1da2d515d36570c84197360afc38e56d63c6eceb' 
  AND token = '3qdA59RNfuWj+aMutQgq0MsAt0ZxMp6VceI/mFHWmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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