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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a767eb1a26a9f2b372a3ec8f3a1e8689ac641afa91de946e441449efa927a69' 
  AND token = 'zh13R259nQFSFR0A5Kxnsih9WSV7g8wyrv+GmQsEIiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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