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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64faa1525ae8d87377395609bc7e44f8c99f5dbb6c0039e5cfcfc2edd17d766b' 
  AND token = '+b3nQtlixa+JAPBs54taZZ+25hczNLAg7gh5COkJiDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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