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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34f893cb5b6bb77ef4ae04454a5c8da3b1eb26c0e314c16157f3d6d7ba65a3f1' 
  AND token = 'ySPl2F92c5KAq6rKdpvY/fWn8K6XCHKuf62tRcVoc70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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