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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd11b543d82da87e452ada22eb76ba4435ca7db00e1cc58b32277f274e6ceab09' 
  AND token = 'DXdN+DHtT5zw+RpcqLerhrr3zjIIpzK80wpxu3p8oq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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